Used as a reference standard in analytical testing to quantify arachidonic acid levels in biological samples such as blood, plasma, and tissues. Commonly applied in lipidomics and metabolomics research to study eicosanoid pathways, inflammation, and cell signaling. Ensures accuracy and consistency in assays involving gas chromatography (GC) or liquid chromatography (LC) coupled with mass spectrometry (MS). Also utilized in quality control for pharmaceutical and nutraceutical products containing polyunsaturated fatty acids.